Breed, alias Azul, was a loner but when he met three nuns traveling across the desert, he offered to escort them. But somehow the trio didn't behave like nuns. They were skilled with guns and hardened to violent death. Breed had to kill many men to protect them but even the corpses were denied a Christian burial. Then Breed discovered that the nuns were in cahoots with Mex banditos robbing the US gold shipments. So he led the Army troopers in a raid of horrible revenge that made the victims pray for mercy...